820854825 has 24 divisors (see below), whose sum is σ = 1551025728. Its totient is φ = 375247680.

The previous prime is 820854803. The next prime is 820854841. The reversal of 820854825 is 528458028.

It is not a de Polignac number, because 820854825 - 2⁸ = 820854569 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 781242 + ... + 782291.

It is an arithmetic number, because the mean of its divisors is an integer number (64626072).

Almost surely, 2^820854825 is an apocalyptic number.

It is an amenable number.

820854825 is a deficient number, since it is larger than the sum of its proper divisors (730170903).

820854825 is a wasteful number, since it uses less digits than its factorization.

820854825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563553 (or 1563548 counting only the distinct ones).

The product of its (nonzero) digits is 204800, while the sum is 42.

The square root of 820854825 is about 28650.5641305717. The cubic root of 820854825 is about 936.3152964288.

The spelling of 820854825 in words is "eight hundred twenty million, eight hundred fifty-four thousand, eight hundred twenty-five".